https://luminoussheep.net/mediawiki/index.php?action=history&feed=atom&title=EJB_Life_Cycle 2026-04-16T19:04:21Z Revision history for this page on the wiki MediaWiki 1.43.8 https://luminoussheep.net/mediawiki/index.php?title=EJB_Life_Cycle&diff=54&oldid=prev 2021-09-14T21:25:19Z

<p>Created page with &quot;= EJB 3.0 = <a href="/mediawiki/index.php/File:Stateless-lifecycle-3.png" title="File:Stateless-lifecycle-3.png">frame|Stateless 3</a> <a href="/mediawiki/index.php/File:Stateful-lifecycle-3.png" title="File:Stateful-lifecycle-3.png">frame|Stateful 3</a> == Stateless == * Can be created and destroyed with each...&quot;</p> <p><b>New page</b></p><div>= EJB 3.0 =<br /> [[Image:stateless-lifecycle-3.png|frame|Stateless 3]]<br /> [[Image:stateful-lifecycle-3.png|frame|Stateful 3]]<br /> == Stateless ==<br /> * Can be created and destroyed with each call - unlikely<br /> * Only one client per running bean<br /> === Create ===<br /> # Must have no arg constructor (Class.newInstance() calls this)<br /> # Resources marked with annotations injected<br /> # Method called annotated with @javax.annotation.PostConstruct or specified in the deployment descriptor<br /> ## contract: void, no args, no checked exceptions<br /> &lt;pre&gt;<br /> &lt;post-construct&gt;<br /> &lt;lifecycle-callback-method&gt;postCreate&lt;/lifecycle-callback-method&gt;<br /> &lt;/post-construct&gt;<br /> &lt;pre-destroy&gt;<br /> &lt;lifecycle-callback-method&gt;tidyUp&lt;/lifecycle-callback-method&gt;<br /> &lt;/pre-destroy&gt;<br /> <br /> &lt;/pre&gt;<br /> <br /> === Destroy ===<br /> * methods marked with @PreDestroy<br /> ** must be only one void, no args, no checked exceptions<br /> <br /> === Exceptions ===<br /> * System exception =&gt; Bean is destroyed and @PreDestroy is not called<br /> ** System exception is any unchecked exception (which isn&#039;t annotated with @ApplicationException)<br /> <br /> == MDB == <br /> Essentially the same as stateless<br /> <br /> = EJB 2.0 =<br /> [[Image:stateful-lifecycle.png|frame|Stateful 2.0]]<br /> = Stateless =<br /> * same lifecycle as EJB 3<br /> clients can call remove - this invalidates the bean for this client and returns it to the pool<br /> <br /> = Stateful =<br /> * same lifecycle as EJB 3 different interface<br /> java serialisation equivalent technology used to passivate and store bean state.<br /> * represents client state - cached but not (may be passivated - stored temporarily)<br /> * passivate stores state to filesystem<br /> <br /> == Create EJB ==<br /> #newInstance()<br /> #setSessionContext(sc)<br /> #ejbCreate()<br /> <br /> <br /> == Start Transaction ==<br /> #afterBegin()<br /> <br /> == Commit Transaction ==<br /> #beforecompletion()<br /> #afterCompletion(true)<br /> <br /> == Rollback Transaction ==<br /> #afterCompletion(false)<br /> <br /> == Passivate ==<br /> #ejbPassivate()<br /> * Transaction state, session context etc are maintained though passivation<br /> <br /> == Activate ==<br /> #ejbActivate()<br /> * transients are undefined when reactivated - unlike serialisation<br /> <br /> == Client finished - calls remove() ==<br /> #ejbRemove()<br /> <br /> == Timeout ==<br /> Container may call @PreDestroy but this isn&#039;t required by spec</div>

Martin